<html>
    <head>
        <script type="text/javascript" src="scripts/jquery-1.4.2.min.js" ></script>
        <script type="text/javascript" >
            $(function() {
                $('#123').text('current');
                $('#123').load("json/test.txt");

            });
        </script>
    </head>
    <body>
        <div id="123">
            Before
        </div>

    </body>
</html>